RIVERSIDE — A man wanted for more than a decade in connection with four killings in Los Angeles was in custody today following his arrest at his Riverside home, where he had been living under an assumed name for years unbeknownst to his neighbors and even his fiancee.

And images on Facebook helped authorities close in on the wanted fugitive.

Eduardo Rodriguez, 35, was arrested about 6:30 p.m. Thursday at the residence in the 3500 block of Farnham Place, according to Laura Vega of the U.S. Marshals Service.

Rodriguez — also known as Juan Carlos Campos Gamino — was one of the Los Angeles Police Department’s most wanted fugitives. He was charged in Los Angeles County in 2003 with four counts of murder and two counts of attempted murder, and disappeared soon afterward.

“At the time Rodriguez was charged with these crimes, he was second-in-command of the Toonerville criminal street gang under Timothy McGhee,” Vega said.

McGhee — who was on the U.S. Marshals Service’s “15 Most Wanted Fugitive List” when he was arrested in Arizona in 2003 — was sentenced to death in January 2009 for the Oct. 14, 1997, shooting death of Ronnie Martin; the June 3, 2000, killing of Ryan Gonzalez; and the Nov. 9, 2001, killing of Margie Mendoza. McGhee was also tried separately and convicted of participating in a jail riot in which deputies in a high-security unit of the Los Angeles Men’s Central Jail were pelted with items from inmates’ cells.

Rodriguez is charged with the killing of Mendoza, who was shot in Atwater Village while in a car with a man who belonged to a rival gang, authorities said.

The other three murder charges against Rodriguez stem from the Aug. 8, 2001, killings of Bryham Robinson, Cheri Lynne Wisotsky and Mary Ann Wisotsky.

Robinson, 38, was sitting in a car that was double-parked in Atwater Village with Cheri Wisotsky, 45, and her 64-year-old mother, Mary Ann, when they were attacked in an apparent execution-style shooting, police said soon after the crime. All three died at the scene.

The murder charges include the special circumstance allegation of multiple murders, along with gun allegations. Prosecutors will decide later whether to seek a death sentence against Rodriguez.

It was not immediately clear how soon he would be arraigned.

Rodriguez’s arrest was triggered by a Glendale police detective who was familiar with the activities of the Toonerville gang, which claims Glendale as part of its territory, authorities said. The detective found pictures of Rodriguez on Facebook pages linked to his associates, then found one on the Facebook page of Rodriguez’s fiancee — who was unaware her carpenter husband was living under a fake name and was a wanted criminal.

Investigators staked out the home Thursday night and arrested Rodriguez when he was leaving for work, according to the Marshal’s Service.